Piston.



R. F. IOHNSON..

PISTON.

I APPLICATION FILED JULY 6. 1916- Patented N 0v. 6, 1917.

UNITED STATES RUSSELL F. JOHNSON, 0F ROBERTS, CALIFORNIA.

PISTON.

Specification of Letters Patent.

Patented Nov. 6, 191 '7.

Application filed July 6, 1916. Serial No. 107,784.

To all whom it may concern:

This invention relates to a reciprocatingpiston and particularly pertains to a piston adapted to be used within high duty pumps and compressors, as well as engines of various types; 7

It is an obj ect of this invention to provide a piston for use in the above classes of machinery which has a cylinder intake valve incorporated in its construction, said valve being adapted to open upon the back stroke of the piston and to tightly close upon the compression stroke without the aid of springs or complicated operating mechan1sm. 7

Another object is to provide a piston which is adapted to have a floating action as well as be free to rotate independent'of the piston rod and will thus roperly adjust itself to the surface of its cylinder without binding and without uneven wear.

Another object is to provide baflle members through which the incoming fluid passes and which members will act to prevent foreign substance from passing mto thecylinder and thus creating damage therein.

Another object is to provide simple means for regulating and limiting the movement of the valve and at the same time insuring that the valve will be open the full length of the back stroke and closed the full length of the compression stroke.

Another ob ect is to provide a combined piston and valve which is adapted to close in a more positive manner the higher the compression is within the cylinder.

It isa further object to provide a combined piston and cylinder valve which is dotted lines the relative position of the valve and piston members at the beginning of the back stroke.

Fig. 2 is a view in. section as seen on the line 2-2, of Fig. 1 and illustrates the battle plate and=the arrangement of the orifices therethrough.

Referring to the drawings more particularly, 10 indicates a pump cylinder which may be of any preferred type andwhich is here shown as being provided with'a checkvalve 11. The valve construction here shown, however, is not imperative and is shown merely for the sake of clearness. Mounted to reciprocate within the cylinder, is a piston 12 which is fitted with a suitable number of piston rings 13 around its outer periphery. The piston is actuated by a piston rod 14 upon the endof which 1s a puppet valve mechanism 15 adapted to act 'in cooperation with the piston and within which the present invention is involved.

The puppet valve 15 is tapered from its interior face and is adapted to seat upon,a tapervalve seat 16 formed concentric with and through the end wall 17 of the piston. Formed .upon the piston rod 14 and in the rear of the valve member 15 is a pair of circular battle and supporting disks 18 and 19 which are of an outside diameter approximately equal to the inside diameter of the piston and are adapted 'to hear thereagainstoand reciprocate thereupon. These baflle disks areconfined within the piston by means of a locking ring 20 which is externally threaded and engages an-internally threaded bore 21 formed at the rear end of the piston. A locking pin 22 is driven through the piston wall and into the locking ring to hold it in'position. It will thus be seen that by adjusting the ring member 20 various spaces may be made between the inner face of the ring and the rear face of the disk for a purpose which will be hereafter described' The disks 18 and 19 are each provided with a series of perforations 23 which are concentrically arranged around the disks and the piston rod. These perforations are provided for the purpose of allowing a fiuld to pam from the rear of the piston around the open valve and into the cylinder head upon the back strike of the piston.

In operation, the piston rod 14 is recipro cated by means of any preferred operating mechanism and, when so actuated, moves lags behind due to the surface area of the compression within the cylinder.

end 17 of the piston which is opposed by the This allows the'valve to become positively seated upon the valve seat' 16 after which the rod vand piston will movein unison throughout the compression stroke Upon the return stroke, the piston rod will draw away from the piston and allow the valve to become unseated from the seat 16. The amount of opening betweenthe valve member and its seat will be determined by the adjustment of the adjusting ring 20 which is engaged by the disk 19 upon the return stroke and I thus limits the opening of the valve as well 1 draw' stroke.

' as provides a substantial member by which the piston may be returned to the end of its It is evident that while the piston is returning throughout its draw stroke air or a fiui'd may pass through the perforations 23 and around the valve into the cylinder.

.It will thus be seen that a combined piston and cylinder valve is here provided which eliminates the use of complicated valve mechanism and which will operate in a simple and efiective manner without great danger of becoming disordered or worn.

I claim:

1. A piston, comprising a cylindrical piston body member, an end wall across one end thereof, a conical valve seat formed through said end wall, and with its enlarged'diameter within the piston member, an adjusting ring mounted at the opposite or open end of-the piston member, a piston rod adapted to extend through a central opening in the adjustment ring and into the piston body, a pair of spaced bafiie disks formed upon the piston rod and adapted to support it within the body member, said disks restricted in their movement by the adjustingring, and a valve member formed at the terminating end of the piston rod and adapted to seat upon the conical seat in the.

end wall of the body member, and means whereby the reciprocation of the piston rod will act to open and close the-valve as well as reciprocate the piston bodymember.

2. A piston comprising a cylindrical piston body member, an end wall across one end thereof, a conical valve seat formed through said end wall with its enlarged diameter within the piston member, a piston rod, a pair of spaced bafiie disks upon the piston rod within the body member, a valve member formed at the end of the piston rod and adapted to seat upon the conical seat in the end wall of the body member, and a ring mounted in the open end of the body memher to hold the baflie disks in the body member and allow said disks restricted movement as required to open and close the valve.

In testimony whereof I have signed my name to this specification.

RUSSELL F. JOHN SON. 

